JP3077996B2 - Curved pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a curved pipe provided in a building such as a middle and high-rise building, and more specifically, to secure a ventilation in the pipe.
The present invention relates to a bent pipe that prevents a water sealing effect of a drain trap from being impaired.

(Prior Art) For example, a drainage device installed in a middle-high-rise building or the like includes a vertical pipe installed vertically in order to pass through each story, a horizontal pipe installed horizontally, and a vertical pipe. It is composed of a bent pipe disposed between the pipe and the horizontal pipe so that the sewage and drainage discharged from each level are discharged to the sewer pipe and the sewage pipe through the standing pipe, the bent pipe and the horizontal pipe. It has become.

By the way, when a large amount of drainage flows down at a time when drainage flows down in a vertical pipe, this drainage is distorted in a curved pipe and closes the pipe to create a negative pressure in the vertical pipe, thereby being connected to a drainage device. There was a problem that the traps of various sanitary kitchen appliances were broken, and the odor in the drain pipe flowed back into each room.

Therefore, conventionally, as shown in, for example, Japanese Patent Publication No. 59-5729, drainage is caused to flow down while turning the inside of a vertical pipe.

However, when the swirled drainage flows into the bent pipe, the drainage rises along the inner surface of the bent pipe to the upper space in the bent pipe while maintaining the swirl flow, and the inside of the bent pipe is drained. May block.

In particular, the drainage flowing down the standing pipe suddenly changes its horizontal direction in the bent pipe section, so if the drainage contains detergent, etc., bubbles will be generated in the bent pipe and the horizontal pipe section. Is generated, and the air bubbles stay at the entrance of the horizontal pipe, and the horizontal pipe may be blocked by the detergent air bubbles.

When the inside of the drainage device is blocked by drainage in this way,
The air layer in the drainage device is not communicated vertically, and the flow of the drainage causes a negative pressure in the drainage device above the clogged portion, thereby causing the above-described trap breakage problem.

In order to solve the above-described problem, conventionally, as shown in FIG. 8, a protruding ridge c is provided along the pipe axis direction at the lower portion of the inner peripheral surface of the bent pipe a and the horizontal pipe b. A drainage device has been proposed which prevents the drainage flowing down from d from rising to the upper space of the curved pipe a, and rectifies the flow of the drainage to secure an upper air layer in the curved pipe a (for example, there has been proposed a drainage device). Japanese Utility Model Publication No. 60-5112).

(Problems to be Solved by the Invention) However, in the configuration disclosed in the above-mentioned publication, since the ridge c protrudes from the bottom of the curved pipe a, fibers such as dust, cloth, and hair contained in the drainage water. The debris is likely to be caught by the ridge c, and therefore, there is a risk that the fiber debris and the like may accumulate on the bottom piece of the bent pipe a and block the bent pipe a.

The present invention solves the above-mentioned disadvantages, and aims at preventing a large negative pressure from being generated in a pipe,
It is an object of the present invention to provide a bent pipe that can prevent a water trapping effect of a drain trap from being impaired and that does not have a risk of fiber debris or the like being clogged inside.

(Means for Solving the Problems) A bent pipe according to the present invention is interposed between a lower end of a standing pipe in which drainage flows down while rotating in the pipe and a starting end of a horizontal pipe, and is provided at a connection portion with a lower end of the standing pipe. The cross-section is circular, the cross-section at the axial center is approximately oval, and from the connection with the lower end of the standpipe, the cross-section is substantially oval from the circular shape toward the center in the axial direction. Is characterized in that the diameter of the connecting portion is larger than that of the connecting portion with the lower end of the standing pipe.

(Operation) According to the bent pipe of the present invention, the drainage that is going to rise to the upper part of the bent pipe along the inner surface of the bent pipe is prevented from turning normally on the bottom side of the bent pipe, and the turning energy is lost. easy. That is, in the conventional drainage device in which the curved pipe is formed in a circular cross section, the drainage easily rises up to the upper space of the curved pipe along the curved surface of the curved pipe. As a result, the drainage swirling in the pipe collides with each other. Therefore, the swirling energy of the drainage is lost, and the drainage does not easily rise along the inner surface of the bent pipe to the upper space of the bent pipe.

 As a result, swirling of drainage is efficiently suppressed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the drainage device includes a standing pipe 2 disposed vertically in each level of a building, and a horizontal pipe 3 disposed substantially horizontally in the building. And a bent pipe 1 disposed between the standing pipe 2 and the horizontal pipe 3.

The bent tube 3 has an axial center 11 formed in a substantially oval cross section.
And a cylindrical connecting portion 12 connected to an end of the central portion 11 connected to the standpipe 2 and a cylindrical connecting portion 12 connected to an end of the central portion 11 connected to the horizontal pipe 3. And a connection portion 13.

One connecting portion 12 is integrally provided with a flange portion 18 connected to a flange portion 21 provided at a lower end portion of the standing pipe 2 formed in a cylindrical shape.

Further, the other connecting portion 13 is integrally provided with a flange 19 connected to the flange 31 at the end of the horizontal tube 3.

The bent pipe 1 is formed by bending the entirety of the bent pipe 1 by approximately 90 degrees so as to be continuous from the lower end of the standing pipe 2 to the end of the horizontal pipe 3. 15 and upper part
16 and both side portions 17, 17 disposed between them.

A bottom inner surface 15a at the central portion in the axial direction of the bent pipe 1 is formed to have a smaller diameter than the upper inner surface 16a, and the bottom inner surface 15a and the upper inner surface 16a are continuously provided on both side inner surfaces formed by the curved tapered surfaces 17a, 17a. It has a substantially oval cross section.

The portion of the bent pipe 1 extending from the central portion in the axial direction to both ends approaches a generally oval to a circular shape toward the both ends, and has a true circular shape at both ends (FIGS. 4 and 5). , FIG. 6, FIG. 7).

The bent pipe 1 having the above-described configuration is disposed between a standing pipe 2 which is disposed vertically in a vertical direction so as to cover each level of a building and a horizontal pipe 3 which is disposed in a substantially horizontal direction. The flange of the connection part 12
A flange 21 at the lower end of the standing pipe 2 is connected to 18 and a flange 31 of the horizontal pipe 3 is connected to a flange 19 of the other connecting portion 13 of the bent pipe 1 so that the respective pipes are connected. Is done.

Next, the operation of the drainage device thus configured will be described.

When the drainage flows down from the standing pipe 2 into the bent pipe 1 while turning, the drainage is prevented from turning normally on the bottom inner surface 15a side of the bent pipe 1 and the drainage turned inside the pipe collides with each other. The energy of drainage is lost, and both sides
The drainage does not rise to the upper part of the inner surface of 7 and the drainage flows down the lower part of the bent pipe 1.

In this way, the drainage flows down the inside of the bent pipe 1 and is sent to the horizontal pipe 3 while the air layer is always present at the upper part of the bent pipe 1, so that the inside of the standing pipe 2 becomes a negative pressure. There is no.

(Effects of the Invention) As described above, according to the present invention, the swirling energy of the drainage flowing down from the standing pipe and entering the bent pipe while turning is eliminated in the bent pipe to be rectified, and the inside of the bent pipe is closed by the drainage. Can be prevented. Therefore, an air layer is always formed at the upper part of the bent pipe, which can prevent a negative pressure from being generated in the drainage device, and when a large amount of drainage flows from the sanitary kitchen drainage device into the drainage pipe. However, it is possible to reduce the fluctuation of the air pressure in the drain pipe and prevent the trap from being broken.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of a drainage device according to one embodiment of the present invention, partially cut away, FIG. 2 is a front view thereof, FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 5 is a sectional view taken along line IV-IV of FIG. 2, FIG. 5 is a sectional view taken along line VV of FIG. 2, FIG. 6 is a sectional view taken along line VI-VI of FIG. 2, and FIG. FIG. 8 is a sectional view of a conventional drainage device. 1 ... Bent tube, 2 ... Standing tube 3 ... Horizontal tube, 11 ... Central part in axial direction 15a ... Bottom inner surface, 16a ... Upper inner surface 17a ... Curved tapered surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E03C 1/12 F16L 43/00

Claims (1)

(57) [Claims] 1. A cross section of a connecting portion between a lower end of a standing pipe and a starting end of a horizontal pipe in which drainage flows down while swirling in the pipe, and a cross section of the connecting portion with the lower end of the standing pipe is formed in a circular shape, and has a central portion in the axial direction. Has a substantially oval cross section, and has a substantially oval shape from a circular shape toward the center in the axial direction from a connection with the lower end of the standing pipe, and a connection with a starting end of the horizontal pipe is connected to a lower end of the standing pipe. A curved tube characterized by having a larger diameter than the section.